华南理工大学学报(自然科学版) ›› 2006, Vol. 34 ›› Issue (2): 92-99.

• 土木建筑工程 • 上一篇    下一篇

后张无粘结PC平板一T形柱节点的试验研究

蔡健 李光星   

  • 收稿日期:2004-11-04 出版日期:2006-02-25 发布日期:2006-02-25
  • 通信作者: 蔡健(1959-),男,教授,博士生导师,主要从事结构工程研究 E-mail:cvjcai@scut.edu.cn
  • 作者简介:蔡健(1959-),男,教授,博士生导师,主要从事结构工程研究

Experimental Investigation into Unbonded Post-Tensioned PC Flat Plate-T-Shaped Column Connections

Cai Jian  Li Guang-xing   

  1. Dept.of Civil Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2004-11-04 Online:2006-02-25 Published:2006-02-25
  • Contact: Cai Jian(born in 1959),male,professor,Ph.D. tutor, mainly researches on structural engineering. E-mail:cvjcai@scut.edu.cn
  • About author:Cai Jian(born in 1959),male,professor,Ph.D. tutor, mainly researches on structural engineering.

摘要: 进行了6个足尺PC(预应力混凝土)平板一T形柱节点试件在竖直荷载作用下的冲切性能试验.其中,5个试件的平板中配有无粘结预应力筋,1个对比试件的平板中配普通钢筋.通过试验阐述了节点试件的破坏特征.结果表明:所有试件都产生弯曲冲切复合破坏特征;当接近极限荷载时,预应力筋的应力有较大幅度的增加,但未达到其极限强度;在保持一定的延性的条件下,平板中的预压应力可提高节点的冲切承载力和刚度.文中还根据试验结果给出了临界截面的形状和节点弯曲破坏的位置,最后采用美国ACI规范和我国规范所推荐的计算公式对上述节点的冲切承载力进行了验算.

关键词: 后张无粘结预应力混凝土, 平板, T形柱, 节点, 冲切, 破坏特征

Abstract:

Six full-scale PC(Prestressed Concrete)fiat plate-T-shaped column connections,of which five are post-tensioned with unbonded tendons and one is a parallel specimen constructed with normal bo nded rejnforcjng bars,are experimentally tested to reveal their punching shear performances when being subjected to gravitv loads.The failure modes of the connections are then investigated.The results show that a combined flexural and punching shear failure occurs for each connection ,and that,when the applied load approaches the failuI℃ load,the tendon stre~ greatly increases but does not achieve the ultimate strength. Moreover,the pr -compression stresses in slabs can improve the ultimate strength and stifness of the connection, with the ductility being fairlv kept.Th e profile of the critical section and the location of the flexural failure aIle also presented based on the experimental results,and,finally,the experimental ultimate strengths of the six connections aIle comDaIled with the results obtained according to the provisions in the ACI and the Chinese codes

Key words: unbounded post-tensioned prestressed concrete, fiat plate, T-shaped column, connection, punc-hing shear , failure mode